<template>
  <div class="component-upload-image">
    <el-upload multiple :action="uploadImgUrl" list-type="picture-card" :accept="realAccept"
      :on-success="handleUploadSuccess" :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError"
      :on-exceed="handleExceed" ref="imageUpload" :before-remove="handleDelete" :show-file-list="true"
      :headers="headers" :file-list="fileList" :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit }" :disabled="realDisabled">
      <el-icon class="avatar-uploader-icon">
        <plus />
      </el-icon>
      <template #file="{ file }">
        <div>
          <video class="el-upload-list__item-thumbnail">
            <source :src="file.url">
            您的浏览器不支持 HTML5 video 标签。
          </video>
          <span class="el-upload-list__item-actions">
            <span class="el-upload-list__item-preview" @click="handlePictureCardPreview(file)">
              <el-icon><zoom-in /></el-icon>
            </span>
            <span class="el-upload-list__item-delete" @click="handleRemove(file)">
              <el-icon>
                <Delete />
              </el-icon>
            </span>
          </span>
        </div>
      </template>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip && !realDisabled">
      <template v-if="tip">
        {{ tip }},
      </template>
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
      <template v-if="limit > 1">
        ,最多可上传 <b style="color: #f56c6c">{{ limit }}</b> 个文件
      </template>
    </div>

    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body destroy-on-close>
      <video ref="videoRef" style="display: block; max-width: 100%; margin: 0 auto">
        <source :src="dialogImageUrl">
        您的浏览器不支持 HTML5 video 标签。
      </video>
      <div slot="footer" style="text-align: center;margin-top: 20px;">
        <el-button type="default" @click="playPause" link>
          播放/暂停
        </el-button>
        <el-button type="default" @click="makeBig" link>
          放大
        </el-button>
        <el-button type="default" @click="makeSmall" link>
          缩小
        </el-button>
        <el-button type="default" @click="makeNormal" link>
          普通
        </el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script setup name="customVideoUpload">
import { getToken } from "@/utils/auth";
import { useFormItem, useFormItemInputId, useFormSize, useFormDisabled } from 'element-plus'

const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ['mp4', 'ogg', 'webm'],
  },
  tip: {
    type: String,
    default: ""
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
});
const { form, formItem } = useFormItem()
const { inputId } = useFormItemInputId(props, { formItemContext: formItem })
const inputSize = useFormSize()
const formDisabled = useFormDisabled()
const { proxy } = getCurrentInstance();
const emit = defineEmits();
const videoRef = ref(null);
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + "/system/common/upFile"); // 上传的图片服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() });
const fileList = ref([]);
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize)
);
const realAccept = computed(() => {
  return `.${props.fileType.join(",.")}}`;
});

const realDisabled = computed(() => {
  return props.disabled || formDisabled.value
})
watch(() => props.modelValue, val => {
  if (val) {
    // 首先将值转为数组
    const list = Array.isArray(val) ? val : props.modelValue.split(",");
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      if (typeof item === "string") {
        if (item.indexOf(baseUrl) === -1) {
          // item = { name: item, url: baseUrl + item }; // 图片地址
          item = { name: item, url: item }; // 图片地址 oss不需要拼接地址前缀
        } else {
          item = { name: item, url: item };
        }
      }
      return item;
    });
  } else {
    fileList.value = [];
    return [];
  }
}, { deep: true, immediate: true });

// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    isImg = props.fileType.some(type => {
      if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    proxy.$modal.msgError(
      `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
    );
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy.$modal.loading("正在上传图片，请稍候...");
  number.value++;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  console.log(res, file);
  if (res.code === 0) {
    uploadList.value.push({ name: file.name, url: res.data });
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy.$modal.closeLoading();
    proxy.$modal.msgError(res.msg);
    proxy.$refs.imageUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除图片
function handleDelete(file) {
  const findex = fileList.value.map(f => f.name).indexOf(file.name);
  if (findex > -1 && uploadList.value.length === number.value) {
    fileList.value.splice(findex, 1);
    emit("update:modelValue", listToString(fileList.value));
    return false;
  }
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    emit("update:modelValue", listToString(fileList.value));
    proxy.$modal.closeLoading();
  }
}

// 上传失败
function handleUploadError() {
  proxy.$modal.msgError("上传图片失败");
  proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
}
function handleRemove(file) {
  proxy.$refs.imageUpload.handleRemove(file)
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      strs += list[i].url.replace(baseUrl, "") + separator;
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : "";
}
function playPause() {
  if (videoRef.value.paused)
    videoRef.value.play();
  else
    videoRef.value.pause();
}

function makeBig() {
  videoRef.value.width = 560;
}

function makeSmall() {
  videoRef.value.width = 320;
}

function makeNormal() {
  videoRef.value.width = 420;
} 
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>